Bed and cylinder printing press



Nov. 8, 1932. c. B. COTTRELL, 3D 1,886,530

BED AND CYLINDER PRINTING PRESS Filed May 15, ,1931

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INVENTOR M %W 34/ ATTORNEYS Patented Nov. 8, 1932 UNITED STATES PATENT OFFICE CALVERT B. COTTRELL, 3D, OF WESTERLY, RHODE ISLAND, ASSIGNOR TO C. B. COTTRELL & SONS COMPANY, OF WESTER-LY, RHODE ISLAND, A CORPORATION OF DELAWARE ."BED AND CYLINDER PRINTING PRESS Application filed May 15,

One object of my invention is to provlde certain improvements in a bed and cylinder printing press whereby the product of the press may be increased.

Another object of my 1nven t1o n 1s to provide, in a bed and cylinder printing press in which the bed and form reciprocate in a right line, means for feeding a sheet to the oscillating cylinder, preferably to its under side, on the printing stroke of the cylinder and for taking the printed sheet tail end first from the cylinder, preferably from its upper side, on the non-printing stroke of the cylinder, the cylinder oscillating only about one and onehalf revolutions on each of its strokes where by the printing and transferring of the sheet is obtained with a minimum movement of the bed and cylinder.

A practical embodiment of my 1nvent 1on 1s represented in the accompanylng drawing 1n which:

Fig. 1 represents a side elevat on of my improved bed and cylinder printlng press the parts being shown in full lines in the pos tions thev assume just after the bed and cylinder have started on their forward or printmg stroke, and in dotted lines in the positions the parts assume at the end of the said forward or printing stroke;

Fig. 2 represents a dlagrammatic view of the impression cylinder and 1ts ad acent parts in the positions they assume ust as the 1mpression cylinder has started on the first revolution of its forward or printing stroke and has taken at its under side a sheet from the feeder;

Fig. 3 represents a slmilar vlew show ng the positions of the parts as the impresslon cylinder has completed its forward or printing stroke of about one and one-half revolutions and is ready to start on its reverse stroke for transferring the printed sheet tail end first from the upper side of the cylinder; and

Fig. l represents a similar vlew showing the positions of the parts as the IHIPIGSSlOIl cylinder has completed about one revolution of its reverse or non-printing stroke and the printed sheet has been transferred from the cylinder.

The main frame of the printing press is 1931. Serial No. 537,614.

denoted by 1. The form bed 2 and its form 3 are fitted to reciprocate in a right line in the main frame. The form bed is provided with the usual inking table 4 arranged for coaction With the distributing rollers 5 and form rollers 6 of the inking mechanism, in the usual manner.

The oscillating impression cylinder is denoted by 7 and its grippers by 8. This cylinder is driven in the usual manner from the reciprocating bed by the gear and rack 9 and 10, the relation of the diameter of the cylinder to the movement of the bed being such that the cylinder is oscillated about one and onehalf revolutions on each of its strokes. This impression cylinder is raised out of contact with the form 3 on the return or non-printing stroke of the bed by the usual mechanism denoted by 11.

The feeder for the sheets is denoted by 12 and it may be of any well known or approved form. This feeder is arranged to feed the sheets to the under side of the impression cylinder 7 and it is provided with the sheet stop 13 which may be operated at the proper time by the usual mechanism, not shown herein.

The sheet delivery mechanism may be of any well known or approved form, that shown herein comprising a sheet stripper 14, the end.- less sheet carrier 15 and the coacting sheet delivery rolls 16, 17. The sheet delivery table is denoted by 18. The sheet stripper is arranged to strip the sheettail end first from the upper side of the impression cylinder immediately after the start of the reverse or nonprinting stroke of the cylinder. v

The operation of the printing press is as follows: As the form bed and impression cylinder are started on their forward or printing stroke the impression cylinder grippers 8 will be closed on the head end of a sheet fed from the feeder 12 and released by the sheet stop 13. As the bed and its form are moved in a right line to the end of their forward or printing stroke the impression cylinder will be rotated about one and one-half revolutions to bring the tail end of the printed sheet slightly beyond its transfer point to the delivery mechanism, as shown in Fig. 3.

As the bed and cylinder are started on their reverse or non-printing stroke the impression cylinder 7 is raised by the mechanism 11 out of position to contact With the form which movement also brings the stripper 1 1 into position to strip the tail end of the printed sheet from the Cylinder and direct it, printed side up to the coasting rollers 16, 17 of the delivery mechanism, which rollers then take control of the sheet. WVhen the impression cylinder has rotated a short distance on its reverse stroke, in the present instance about one-half a revolution, the grippers 8 are opened to release the headend of the printed sheet; These grippers are permitted to remain open during the remainder of the reverse stroke of the impression cylinder.

From the above description it will be seen that I have provided means, in a bed and cylinder press in Which the bed and its form reciprocatein a right line, for feeding the sheet to the under side of the impression cylinder and fortransferring the sheet tail end first from the upper side of the impression cylinder, thereby eliminating a considerable amount of Waste movement of both the cylinder and the bed, the printing of the sheet being started immediately after the head end is taken by the grippers at the start of the forward stroke of the bed and cylinder, and the necessary reverse movement of the cylin-' der being mostly utilized in transferring the I printed sheet therefrom;

It is evident that various changes may be resorted to in the construction, form and arrangementof the several parts Without destrokes, means for feeding a sheet to the cylinder on its printing stroke, means to take the printed sheet tail end first from the cylinder on its non-printing stroke, and means for raising the cylinder out of the path of the form on its non-printing stroke.

1. In a bed and cylinder printing press,

a bed and its form reciprocating in a right line, an inking mechanism, an oscillating impression cylinder rotating substantially one CALVERT B. COTTRELL, 3RD.

parting from the spirit and scope of my invention, and hence I do not intend to be limited to the particular embodiment herein shown and described, but 7 What I claim is 1. In a bed and cylinder printing press,

a bed and its form reciprocating in a right line, an inking mechanism, an oscillating impression cylinder rotating substantially one and onehalf revolutions on each of its strokes, means for feeding a sheet to the cylinder on its printing stroke, and means to take the printed sheet tail end first from the cylinder on its non-printing stroke.

v 2. In a bed and cylinder printing press, a bed and its form reciprocating in a right line, an inking mechanism, an oscillating impression cylinder rotating substantially one and one-half revolutions on each of its strokes, means for feeding a sheet to the under side of the cylinder on its printing stroke, and means to take the printed sheet tail end its non-printing stroke.

3. In a bed and cylinder printing press, a bed and its form reciprocating in a right line, an inking mechanism, an oscillating impression cylinder rotating substantially one first from the upper side of the cylinder on i and one-half revolutions on each of its 

